Key result
Porcine renal artery bifurcation geometry suppresses flow separation and flattens wall shear stress distributions.
Why the study?
The bifurcation geometry of the porcine renal artery plays a primary role in determining hemodynamical variables, but detailed numerical analysis was lacking.
Computational modeling of the porcine renal artery bifurcation demonstrates that its specific geometry suppresses flow separation and flattens wall shear stress distribution.
Should not change clinical practice; leaves open whether porcine geometry effects extend to human renal atherosclerosis.
Three-dimensional steady and unsteady flows through the bifurcation of the porcine renal artery were analyzed numerically using the finite-element method. As the bifurcation geometry plays a primary role in determining the hemodynamical variables, the present bifurcation geometry was precisely developed in accordance with the measured data. In the present calculations, the arterial wall was assumed to be rigid and the non-Newtonian effect of blood was not taken into consideration. The calculated results showed that the present difurcation geometry had an effect of suppressing the flow separation. In addition, it was shown that the present bifurcation geometry flattened the spatial distributions of wall shear stress, which has important implications for the concept of Wall Shear Stress Gradient.
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Nakamura et al. (1998) studied Hemodynamics of porcine renal artery bifurcation. Bifurcation geometry of the porcine renal artery was evaluated on Flow separation and wall shear stress distribution. The specific bifurcation geometry of the porcine renal artery suppresses flow separation and flattens the spatial distributions of wall shear stress.
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